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(No Model.) I 2 sheets-sheet 1.

' H. MAHNKEN.

PRINTING TELEGRAPH RECEIVER. No. 422,604. Patented Mar. 4, 1890.

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2 Sheets-Sheet 2.

Patented Mar. 4, 1890.

(No Model.)

' H. MAHNKEN.

PRINTING TELEGRAPH RECEIVER. No. 422,604.

m W m .T N n 4 m W 4 m 4 Mea M v w I 3 W n 7 H ..y m a 9 W "we 3 1 z z 98 2 awfi ww W H 1 u o a a u n O u E M, E m M Q u m UNITED STATES PATENTOFFI E.

HENRY MAHNKEN, OF NEWV YORK, N. Y., ASSIGNOR TO THE COMMERCIAL TELEGRAMCOMPANY, OF SAME PLACE.

PRINTING-TELEGRAPH RECEIVER.

SPECIFICATION forming part of Letters Patent No. 422,604, dated March 4,1890.

Application filed April 19,1889.

To all whom zit-may concern.-

Be it known that I, HENRY MAHNKEN, of the city, county, and State of NewYork, have invented a new and Improved Printing-Telegraph Receiver, ofwhich the following is a specification, reference being had to theannexed drawings, forming a part thereof, in which I Figure 1 is a sideelevation of my improved printing-telegraph receiver. elevation, partlyin section. Fig. 3 is a plan view, partly in section; and Fig. 4 is adetail rear elevation of the feed mechanism.

Similar letters of reference indicate corresponding parts in all theviews.

My invention relates to theclass of printing-telegraphs in which twoseries of characters are printed by means of two type-wheels arranged torotate in different planes.

The object of my invention is to provide means by which a greatercertainty in the ac- .tion of the escapement and unison mechanism may besecured, and in which delicate adjusting and liability to get out ofrepair will be avoided.

The invention will first be described, and then specifically pointed outin the claims.

In describing my improved printingtelegraph receiver it will beunnecessary to enter into the description of the mechanism by which themessage is transmitted, it being sufficient to describe the characterand direction of the current passing through the mag nets of themachine.

My invention will be described in connection with a machine operated bytwo line'- wires; but some portions of the invention are equallyapplicable to machines operated by a single line-wire. 7

All the working parts of my improved printing-telegraph receiver aresupported by a frame A, formed of the frames a a and the cross-bar b andother bars not shown. In the frame A are arranged two trains of gearingfor driving the scapewheels. These trains of gearing, being of theordinary kind, will re quire no special description. In abrac-ket 22,attached to the side frame a, is journaled a tubular shaft B, which isprovided with a pinion C, which is engaged by the spur wheel r.

Fig. 2 is a rear Serial No. 307,667. (No model.)

Upon the outer end of the tubular shaft B is placed the type-wheel D,and upon the said shaft, between the pinion C and the outer arm of thebracket 1), is placed the unison-arm E. Upon the inner end of the saidtubular shaft B, is securedthe scape-wheel F. p

In the tubular shaft ]3 and in supports a If, projecting from the frameA, is journaled the shaft G. To the inner end of the shaftG is attacheda pinion H, which is engaged by the spur-wheel r, and to the said shaftG, be-

tween the pinion H and the scape-wheel F, is

secured a scape-wheel I. In the'side of the said scape-wheel I isinserted a stud 0 which is engaged by the unison mechanism, presently tobe described. On the outer end of the shaft G is placed the type-wheel Jin close proximity to the type-wheel D. It will thus be seen that thetwo scape-wheels I F are arranged in close proximity to each other, andthat they are capable of being driven inde pendently in the samedirection by the two sets of gearing already described.

To the top of the frame A is secured the permanent magnet K, having oneof its poles d at the top of the frame, while the other pole 6 projectshorizontally inward toward the center of the machine and is providedwith a concave face f In an arm g placed betweenthe inwardly-turned endof the magnet K and the upper end of the said frame A, is journaled avertical spindle L, the upper endof which turns infla screw 7L2,inserted in the central part of the magnet K.

Upon the spindle L, opposite to and near the concave face f of themagnet K, is placed an armature i and between the armature and the poled of the magnet K is placed an electromagnet M, which is supported byscrews j passing through the end of the magnet K.- The polar extremitiesof the magnet M are opposite and near the armature t so that when thesaid magnet is energized it is capable of acting upon the armature. Tothe end of the spindle L which is prolonged below the arm g is secured,an escapementpallet N, which is capable of engaging either of the scapewheelsl or F. The escapementpallet N is of the usual form, but isarranged to vibrate in a plane at right angles to the loo plane ofrotation of the scape-wheels. By this arrangement a single pallet isable to control the movement of both of the scapewheels.

In the upper part of the frame A is journaled a rock-shaft O, whichextends across the frame and carries two arms Z the said arms beingprovided with right-angled ends for stopping the scape-wheels. The arm70 is capable of engaging the pins 0 projecting from the face of thescape-wheel l, and the arm Z is capable of engaging the arm E, carriedby the tubular shaft S. To the end of the shaft 0 which projects throughthe side frame on is attached a forked arm m which engages a finger 42*,carried by the armature 0 which is pivoted to the pole (l of the magnetK. To the side f time a is attached the yoke p of the magnet P, thepoles q of the said magnet being arranged opposite each other and uponopposite sides of the armature 0 The said armature o is polarized bycontactwith the end (Z of the magnet K.

To the bar IF of the frame A is adj ustably secured the printing-magnetR, which is further held by guides '1', attached to the sides of thesaid frame A, and in the frame is journalcd a rock-shaft S, carrying anarmaturelever .9 which supports an armature 15 within the field of theprinting-magnet B.

To the rock-shaft S, outside of the frame A, isattached theprinting-lever T, formed of the side arms r if and the cross-bars w Inthe lover T is journaled the guide-roller a and the printing-roller U.The arm v is prolonged beyond the printingroller Z) and carries aspringactuated pawl 0 which engages the ratchet (1 attached to thefeeding-roller c. A spring-detent f secured to the side of the frame A,prevents the ratchet (Z from retrograde motion; but the saidspring-detent f does not prevent the ratchet from being thrown forwardby a quick movement of the lever T.

In machines of this character as ordinarily constructed no provision ismade for preventing the forward movement of the feed-roller e beyond theprescribed limit, and in such machines the consumption of tape is muchgreater than is required for the printing done by the machine. To avoidthe undue forward motion of the feed-roller, I apply to the arm v of theprinting-lever T an auxiliary detent g, which strikes into the spacebetween two adjacent ratchet-teeth and arrests the motion of the saidratchet as soon as the pawl c has moved the ratchet one notch, and thusprevents the ratchet (Z from moving more than one notch at a time. Theroller 6 is provided with a serrated wheel for engaging the paper guidedthrough the machine by the said roller. In the face of the side frame ais inserted a stud Z, which supports an angled 1e V01 911 carrying uponone of its arms a wheel a which is arranged opposite the serrated wheel76. The other arm of the lever m carries a stud 0 which is engaged by aspring said wheels.

p", secured to the edge of the frame, the said spring being arranged totilt the lever m", and thus bring the wheel n into contact with thepaper tape, which passes over the roller 6" and the serrated wheel 70.The pressure of the wheel n upon the paper holds the paper in positiveengagement with the serrated wheel In. The printing-lever T is drawndownward after each action of the magnet R by a spiral spring 703,having one end attached to the said printing-lever, while the other endis conneeted with a thread t, wound around a windlass j, which adjuststhe tension of the said spring. The motion of the printing-lever T islimited by the screws q 4*, arranged above and below the prolongation ofthe arm 1: of the printing-lever.

To the front of the frame A is secured an arm .9, which extendsdownwardly between the type-wheels D J, curving the paper tape, and alsopreventing it from adhering to the To the arm i, which supports thefeeding-roller e, is attached a guide a" for retaining the paper tape inthe proper position in its passage through the machine. To the same armA is also attached a wire guide 1; for guiding the paper tape.

The type-wheels D J are supplied with ink from felt rollers f" f carriedby the arms g 9 secured to shafts h 72F, journaled in the frame A, thesaid felt rollers resting by their own gravity upon the peripheries ofthe said type wheels.

The operation of my improved printing telegraph receiver is as follows:\Vhen an alternating current is sent through the linewire connected withthe magnet M, the armature i is oscillated, imparting a correspondingmovement to the segmental pallet N,whieh acts upon one or the otherscape-wheel I F, allowing it to move forward with a step-bystep motion,the scape-wheel being propelled by the driving weight through the trainof gearing. One of the arms 70* Z is always in position to look one ofthe scape-wheels I F when the wheel returns to zero, and the wheel whichis locked by the said arm cannot move until it is released in the mannerpresently to be described. The other wheel moves forward until theproper letter, figure, or character is brought to the point of printingby the motive power of the train. hen the alternating current throughthe escapementmagnet ceases, the scape-wl1eel operated by the magnetstops and the current is sent through the printing magnet R in thesecond lineuvire, thus bringing up the printing-lever, carrying thepaper tape into contact with the type wheels, and producing theimpression of the desired letter, figure, or character. The wheel not inuse, being locked and immova= ble, exposes a blank space at the point ofprinting, so that no printing takes place upon that wheel. So long asthe current through the printing-magnet is sent in the same di rcetionno shifting of the scape-wheels or typeavheels will. take place; butwhen it is desired to shift from one type-wheel to the other the currentthrough the printing-mag net and through the unison or shifting magnetP, which is in the same circuit, is reversed, thereby shifting theposition of the polarized armature 0 consequently tilting the lever mrocking the shaft 0, unlocking the type-wheel which has been inactive,and locking the one which has been in use, there'- by permitting theescapement-pallet to act uponthat scape-wheel. The type-wheel which wasbefore inactive now rotates upon the oscillation of the segmentalpallet, and the printing is eifected as before. This wheel continues inaction until the current is again reversed in the circuit of theprinting-magnet R and in the shifting or unison magnet P. Whenever theprinting-lever T, after being carried up to produce an impression, isreleased by the printing magnet R, the downward movement of the saidlever turns the ratchet (i one notch in the manner already described andfeeds the paper forward to receive a new character. When it is desiredto move the paper without printing, both the type-wheels are brought tozero and the current produces effects in the printing magnet, itsarmature, and parts connected therewith only, thereby causing theprinting lever to oscillate and operate the feed-roller e withoutproducing any impression upon the paper,

Having thus described myinventiomwhat I claim, and desire to secure byLetters Patent, is-= 1. In a printing=telegraph receiver, thecombination, with a pair of 'scape=wheels placed with their axescoincident so that they rotate in parallel planes, of type=wheelsconnected with the scape wheels, a pallet common to both scape-wheels,arranged to oscillate in a plane at right angles to the planes of thescape-wheels, a spindle carrying the pallet, an armature attached to thespindle, an escapement electro-magnet adapted to operate eitherscape-wheel through the me dium of its armature, and pallets connectedwith the said armature while the other is stopped, an electro-magnet foroperating the shifting mechanism, and a permanent polarizing magnetcommon to the pallet-operating armature and the armature of the shiftingmechanism, substantially as specified.

2. In aprinting-telegraph receiver, the combination of twoindependently-operated scapewheels controlled by a singleescapementpallet, a magnet placed in a line-circuit furnished with apolarized armature and adapted to oscillate the escapement-pallet bymeans of an alternating current, a shifting-magnet for controlling theaction of the scape-wheels, printing mechanism adapted to be operated bya momentary direct current in the printing-circuit, and apolarizingqnagnet common to the escapement=magnet and shifting-magnet,substantially as specified.

3. In aprinting telegraph receiver, the combination of two trains ofmotor-gearing, two scape-wheels propelled independently of each other bythe motor-gearing, two type-wheels operated by the scape-wheels, apallet common to both scape-wheels, a polarized armature, and a magnetfor operating the pallet, a rock-shaft provided with arms for arrestingthe motion of one or the other of the scape- 75 wheels, a shiftingelectro-magnet and polarized armature for operating the rock-shaft, apolarizing-magnet common to the pallet-operating armature and thearmature of the shifting-magnet, and the printing and paper-feed- 8o ingmechanism, substantially as specified.

HENRY MAHNKEN. Witnesses:

GEo. M. HoPKiNs, O. SEDGWICK,

